Which is a pyrimidine?

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Multiple Choice

Which is a pyrimidine?

Explanation:
Pyrimidines are single-ring nitrogenous bases, while purines have two rings. Among the bases listed, adenine and guanine are purines, whereas cytosine and uracil are pyrimidines. In DNA, cytosine pairs with guanine and thymine is the pyrimidine; in RNA, uracil takes the place of thymine but remains a pyrimidine. So cytosine is a pyrimidine, and uracil is as well, which is why cytosine is identified as a pyrimidine in this context. The key idea is recognizing single-ring versus double-ring structures to distinguish pyrimidines from purines.

Pyrimidines are single-ring nitrogenous bases, while purines have two rings. Among the bases listed, adenine and guanine are purines, whereas cytosine and uracil are pyrimidines. In DNA, cytosine pairs with guanine and thymine is the pyrimidine; in RNA, uracil takes the place of thymine but remains a pyrimidine. So cytosine is a pyrimidine, and uracil is as well, which is why cytosine is identified as a pyrimidine in this context. The key idea is recognizing single-ring versus double-ring structures to distinguish pyrimidines from purines.

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